Electric resistance unit or element.



W. S. HADAWAY, J11. ELECTRIC RESISTANCE UNIT 0R ELEMENT.

APPLICATION TILED )JUNE 16,1908. 7 913,535, Patented Apr. 20, 1909 ".Terrecticn in Letters Patent fNe. 9 58,5351.

engaged by a plurality of clamping screws :30 which extend through tapped holes in the side strip 14. In some cases; it may be desirable'to omit one or both of the plates 17 and I8, and, when this is done, the resistance stripmay preferably be sunk'into suitable slots which may be prorided in the I claim my invention: 1. A resistance unit comprising a conducting ribbon having a plurality of slots: alternately open at opposite edges. said ends of the heating bars in orderthat they may be suitably protected trout unury.

current-carrying capacity, and said slots being unequally spaced to increase the resistance of the ribbon adjacent to the ends of the group.

:t. A resistance unit comprising a con- (lueting ribbon having a plurality of slots alternately open at.- opposite edges'to inerease the length of the enrrent-eoinlueting i path thcrethrough, material lengths of ribslots 3 being unequally spaced to increase the l'e- I sistan ee of predetermined portions of the ribbon.

2. A resistance element eomprlsmg a eon-J ducting i'ibbonghaving a plurality of lateral lengths of ribbon having a relatively large of the case in the Patent Oflice.

[SEAL] ribbon having a plurality of groups bon havingrelatively large current-eonduetzng (rapaeltx being provuled at the ends of the unit and ctmstltutilng eondnet'ing leads therefor.

5. .i resistance element comprising a conducting ribbon having a plurality oi groups of slots alternately open at opposite edges. said groups being separated by material lengths of ribbon and similarly provided with end terminals having a relatively large eurrentearrying capacity.

in testimony whereof, I have hereunto subscribed my name this 12th day of June,

Sigma and sealed nag 18th day of May, A. 1)., 1909.

vVlLLl'AM S. llADAvVAY Ja. lVitnesses:

A. B. Rnrxnnns, BIRNICY llIXES.

It is hereby certified that Iletters Patent No. 918,535, granted April 20,1909, upon the application of William Hadaway,'Jr., of East Orange, New Jersey, for an improvement in Electric Resistance Units or Elements/f were erroneously issued to said William S. Hadaway, Jr., as sole owner of said inyention; whereas the said Letter-e Patent should have been issued to Hadawag Electric Heating. and Engineering Compi ing, a corporation of New York, as owner of the entire interest in said inyention, as shown by the assignments of record, in this oflice; and thatxthe said Letters Patent should be read with this correction therein that the same may conform to the record' G. C. BILLINGS, Acting Commissioner of Patents 

